pg_index.indislossy

Can someone tell me what we use indislossy for? The only comment I
could find was:

/*
* WITH clause reinstated to handle lossy indices. -- JMH, 7/22/96
*/
foreach(pl, parameterList)
{
DefElem *param = (DefElem *) lfirst(pl);

if (!strcasecmp(param->defname, "islossy"))
lossy = true;
else
elog(NOTICE, "Unrecognized index attribute \"%s\" ignored",
param->defname);
}

and

bool indislossy; /* do we fetch false tuples (lossy
* compression)? */

Should I remove this column?

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